Li, Jian-Ming, et al. “Fisetin, a Dietary Flavonoid Induces Apoptosis via Modulating the MAPK and PI3K Akt Signalling Pathways in Human Osteosarcoma (U-2 OS) Cells”. Bangladesh Journal of Pharmacology, vol. 10, no. 4, Oct. 2015, pp. 820-9, doi:10.3329/bjp.v10i4.23039.